Internal air cooled exhaust valve



Feb. 23, 932. J. EDMAN INTERNAL AIR COOLED EXHAUST VALVE Filed March 28, 1930 J0 13 l i X J air cooled valves intended for general use but -rammed Feb. 23. 1932 UNITED sTATEsrATENT ol-Fic JOHN EDIAN, F IINNEAPOLIS, MINNESOTA,` SIGNOR-TO IASTERBILT KOTOR COM- YNY, 0I IIINNEAPOLIS, HINNESOT,

A CORPORATION 0F SOUTH DAKOTA.

maar am oooLnn nxnaus'r vanvn A Application lied Inch 28, This invention relates to improvements especially well adapted for use as an exhausti valve for internal combustion en ines and more particularly such an engine -t at is air cooled. The primary object of the invention is to reduce -an air cooledvalve that will p keep t e valve head 'coolthroughont its'fuli f he used in connection with area to prevent carbon, warping and burning, that is comparatively inexpensive to manufacture and that will not leak compression at the stem connection therewith, and that can either an Ltype of engine or overhead type.` i

To the above end, generally stated, the inp vention consists of the novel devices and comin section taken on and valve hea partly-in plan andnpartly the line 3-3 of Fi 1; Fig. 4 is a view correspondingto ig. 1

with the exception that the major portion of the valve stem has been broken away and that said stem hasnot been wfelded to the valve stem; and :v4 Figs; 5 and 6 are fragmentary detail views in section showing diii'erent ways of forming -1 grooves in the joint between the valve stem Referring first to the invention as shown in Figs. 1 to 4, inclusive.

The numeral 7 indicates a valve head having a flat top anda beveled peripheral face 8 which rests on a valve seat therefor, not shown. Formed in the valve head 7 in- Ward of its face 8 is a large annular recess 9 V that is concentric to said face and which recess materially decreases the thickness of the vali-e head 7. The surface 10 between the face 8 and recess9 isbeveled to a pitch somewhat less than that of the face 8 to more clearly daisies Said'fa `and facilitate thegrinding thereof.

i .Thevalve stem 11 is made independent of the valve head VZ having a constant' diameter except at its inner end portion where the same aresto form a neck- 12. Integrally formed onthe outer end of thene'ck 12 is an annular ange 13* having a-width which substantially corresponds to the depth-of the recess 9 andfwhi'ch `forms an axial extension of the neckj12 and is concentric to the stem 11.

and is in the form offa'tu-be 4 Within the valve stem 11 is a central longituclinally extended partition 14 the outer end of which is curved laterally and merges with the adjacent side of the stem 11 to close the outer end of the passageway 17 -to the passageway 16. The inner end of the partition 14 extends into the neck 12 and terminates substantially at the longitudinal center thereof vto leave Within the outer end portion of the neck 12, theiiange 13 and head 7 an air expansion chamber 15 which connects the long vair passageway 16 and the short air passageway 17 formed bythe partition 14.

'The passageway l'extends thefull length of the stein 11 and connects the outer end thereof with the air expansionchamber 15.

In the side of the stem 11 at lthe outer end of the air passageway`17 is an air ort 18 which connects theexpansion cham 'er 15,

through the short air passageway 17, with theexte'rior of' the valve -stem 11. The air port 1 8- has an air-conducting capacity which isY equal, atleast, to that of the passageway Both sides of the inner end portion of the partition 14- within the neck 12 are curved toward diametrically opposite sides of said neck to ail'ord diverging deflecting surfaces 19.

The flange 13 istelescoped into the recess 9 with a tight lit and a V-shaped groove is formed in the outer portion of the joint be tween the head 7 and flange 13 which isiilled with `awelding material 21 that rigidly conf nects the valve head and stem. i

Figs. 5 and 6 show different ways of formn ing the groove 20 to receive the welding material 21. v

It will be understood that air is induced in the valve stem by a fan or any other suitable means but for the purpose of this case it will not be necessary to consider the same.

y The circulation of air through the air passageways 16 and 17 and the expansion chamber may be in either direction, to wit: through the air passageway 16, expansion chamber 15, air passageway 17 and port 18, or, in reverse order. When cold air enters the chamber 15 and cornes in Contact with the het valve head T it is heated thereby and expands in all directions over the internal surface of the valve 7, neck 12 and flange 13 and produces an air circulation that carries the .heat ladened air to the exterior ofthe stein either through the outer end of said stem or through the port 18 depending upon which Way the air is circulating. The deflecting surfaces 19 direct the air to the far sides of the air expansion chamber 15 and thereby prevent the same from circulatingfrom one air passageway 16--17 to the other without passing over the entire surface of the Valve head.

In Welding the Valve stem to the valve head said head is placed on a support with its stein in an upright position and the flange 13 securely holds the stern in the valve head in axial alignment therewith. Durin the welding of the valve stem 11 to the va ve head 7 the welding material will ilow in the groove 2() and rigidly connect said stem and head and at the saine time leave the joint therebetween in a neat and finished appearance. This method of connecting the valve stein to a valve head eliminates all danger of cornpression leakage for the reason that there is no joint in the valve head or its face that 1s exposed to the force of compression.

What I claim is:

1. A two-part valve of the class described including a head having a peripheral face and an arial recess concentric with said face, and a tubular stein the inner end portion Yof which is telcscoped into said recess and welded to the head.

2; -X two-part Avalve of the class described including a head having a peripheral face and an axial recess concentric with said face, and a tubular stein the inner end portion of which is tele-,scoped into said recess, and a groove in the outer edge portion of the lioint. between the head and stern, and a welding material in said grcmve rigiilly connecting the head and stein.

3. A two-part valre of the class described including a head having peripheralfface and an axial rec corai'entric with said face, and a tubular stein having a flaring neck and. an axially extended annular flange on the neck tightly fitted in said recess and rigidly secured to the head.

4. A two-part valve of the class described including a head having a peripheral face and an axial recess concentric with said face, and a tubular stern having a flaring neck and an axially extended annular flange. on the neck tightly telescoped in said/recess an rigidly Isecured thereto. v f

5. p two-part valve of the class d/escribed including a head having' a peripheral face and an axial recess concentricwith said face, and a tubular stem aving a. flaring neck and an axially extended annular flange on the neel; tightly tclescoped in said recess, a groove in the outer edge port-ion of the joint between the head and flange, and a welding material in the groove rigidly connecting the head and ange.

(S. A valve of the class described having a tubular stein, a longitudinal partition in the stein dividing said stem into a long air passageway and a short air passageway, an air expansion chamber at -the-inner end of the stern connecting said two passageways, and a port in the stem at tli'e outer end of th short air passageway.

7. The structure defined in claim 6 in which the partition has in one of the air passageways an air deilecting surface.

8. The structure defined in claim 6 in which the partition has in each air passageway an air deflecting surface.

9. A twofpart valve of the class described including a head having a peripheral face and a large axial recess concentric with said face, and a tubular stem having on its inner end a flaring neck and an axially extended annular flange on said neck that is concentric with the stem, said flange being telescoped' into said reeess'and welded to the head, said stein having a longitudinally eX- tended partition dividing the stem into a long air passageway and a short air passageway, said stem having a port at the outer end of the short passageway, and an air expansion chamber in the stem at the head connecting said 'two passageways.

In testimony whereof I alix my signature.

JOHN EDMAN. 

